Stephen Larsen: Head and Heart: Combined Modalities: The LENS neurofeedback and HRV training Rosemary Macgregor: How to Teach Breath Self-Regulation with an Understanding of HRV, RSA, C02, and the connection to Brain Training Paul Lehrer: Measuring and Improving Cardiovascular Homeostasis By Heart Breathing Biofeedback Naras Bhat: Preventing and Healing Heart Disease with Biofeedback and Related Modalities Rollin McCraty: Psychological Coherence: the relationship between heart brain dynamics, positive emotions, improved health and optimal performance